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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92b4619429a9ae0f78b859cf92265351a92e4ec5ca1f57203c3d936d756fe70' 
  AND token = 'iaXOaRWghbR6FxFC2teFaUNyhDggEyQfYxF12N+16LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}